CA Certificate request failure - The RPC server is unavailable - DCOM was unable to communicate with the computer

iis-7 certificate dcom
Spawnrider picture Spawnrider · Jul 31, 2013 · Viewed 12.9k times · Source

I am facing an issue while trying to request user certificate from a Microsoft CA on IIS7/Windows Server 2008 R2.

For requesting certificate, I am using the CCertRequest submit method.

In my logs, I have the following error :

CCertRequest::Submit: The RPC server is unavailable. 0x800706ba (WIN32: 1722) COMException    at CERTCLIENTLib.CCertRequestClass.Submit(Int32 Flags, String strRequest, String strAttributes, String strConfig)

and the associated DCOM error in Event Viewer :

DCOM was unable to communicate with the computer cert.XXX.com/XXXCA using any of the configured protocols.

When I ping the CA using CertUtil command tools, the command is successfully :

C:\Windows\system32>certutil -ping -config "cert.XXX.com\XXXCA " Connecting to cert.XXX.com\XXXCA ... Server "XXXCA" ICertRequest2 interface is alive CertUtil: -ping command completed successfully.

Do you have any idea to help me ?

Answer

Spawnrider picture Spawnrider · Jul 31, 2013

I fixed it!

The valid configuration string for the Certificate Services server is

ComputerName\CAName

and not

ComputerName/CAName

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